K2-no transmit on SSB ?

[Gary Marks]

I just finished the alignment using Spectrgram and all seems to be OK. The
rig will transmit on CW OK. I am getting no output on upper or lower
sideband. I'm using another receiver to listen to the K2's signal. I can
hear a tone when transmitting but no voice audio. Neither can I hear myself
in the headphones (Heil Pro-Set K2) with the 5.6K resistor between pins 1
and 6 and all 8 jumper's installed.

I run some voltage checks using the KSB2 manual and most were close to the
manuals reading except the following:

U1 Pin 16 should be 5.4 on TX and it is 3.08
U1 Pin  17 should be 5.6 on TX and it is 4.15
U1 Pin  28 should be 2.4 on TX and it is 5.44

U2 Pin  1 should be 5.6 on TX and it is 4.15

U3 Pin  5 should be 0.4 on both RX and TX and it is .26 on both

D11 on SSB should be 0 and it is .14

Any suggestions. I've probably been at this too long and am missing
something simple.

THANKS
Gary
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Don Wilhelm-3]

Gary,

I would not be very concerned for the time being about the signal voltages
that you mentioned.

First it would be nice to know whether you have a problem with the mic or
the K2.  I realize that the mic comes fully assembled and should be good,
but if it has not been used before, it is on the suspect list.  If you can
find anyone else with a K2 wired for the Elecraft mic configuration, you can
easily check the mic.

On the KSB2 board, anything is suspect.  First, check the orientation of all
the diodes.  All the cathodes should be positioned away from the board.

Check especially D14 to be certain you have placed the cathode lead in the
proper hole - the correct one is to the right of the diode body.

And, last, but not least, check the soldering.  The KSB2 board is quite
dense and solder bridges are possible.  When you have finished checking the
soldering, re-check it, and when you have finished that - check the
soldering.  Soldering is the first suspect and incorrectly placed components
are the second most common problems.

73,
Don W3FPR


> -----Original Message-----

>
> I just finished the alignment using Spectrgram and all seems to
> be OK. The
> rig will transmit on CW OK. I am getting no output on upper or lower
> sideband. I'm using another receiver to listen to the K2's signal. I can
> hear a tone when transmitting but no voice audio. Neither can I
> hear myself
> in the headphones (Heil Pro-Set K2) with the 5.6K resistor between pins 1
> and 6 and all 8 jumper's installed.
>
> I run some voltage checks using the KSB2 manual and most were
> close to the
> manuals reading except the following:
>
> U1 Pin 16 should be 5.4 on TX and it is 3.08
> U1 Pin  17 should be 5.6 on TX and it is 4.15
> U1 Pin  28 should be 2.4 on TX and it is 5.44
>
> U2 Pin  1 should be 5.6 on TX and it is 4.15
>
> U3 Pin  5 should be 0.4 on both RX and TX and it is .26 on both
>
> D11 on SSB should be 0 and it is .14
>
> Any suggestions. I've probably been at this too long and am missing
> something simple.
>
> THANKS
> Gary
>

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com